How to Check if HMRC Owes You a Tax Refund (2025/26)

Every year, large numbers of UK taxpayers pay more Income Tax than they actually owe. It usually happens quietly, through nobody’s fault: the wrong tax code, emergency tax after starting a job, a gap between jobs, stopping work part-way through the year, or expenses you were entitled to claim but never did. Because the deduction happens automatically through PAYE, most people never realise the money has gone.

The reassuring news is that HMRC has clear, well-established systems for putting overpayments right — and you can check for free. This guide explains, in plain English, what a tax refund is, why they happen, how to check whether HMRC owes you money using your Personal Tax Account, how P800 calculations and Simple Assessment work, when HMRC refunds you automatically, when you need to claim yourself, and how to stay safe from the tax refund scams that target this exact topic.

Everything here reflects HMRC guidance for the 2025/26 tax year. Worked examples are illustrative, and this guide is educational rather than personal tax advice. It does not promise that a refund is due in your situation — only your own records can confirm that.

The quick answer

What is a tax refund?

In short: a tax refund (or “tax rebate”) is simply money HMRC gives back when you have paid more Income Tax than you actually owed for a tax year. It is your own money being returned — not a bonus or a windfall.

A tax refund is a repayment of tax you paid but did not owe. The UK collects most Income Tax through PAYE (Pay As You Earn), where your employer or pension provider deducts tax before you are paid, based on the tax code HMRC gives them. PAYE is designed to be roughly right across a full year, but it works from estimates — so when something changes, you can easily end up having paid too much.

When the tax deducted over the year turns out to be more than your actual bill, HMRC owes you the difference. That difference is your tax refund. The same principle applies whether you are an employee, a pensioner, or someone who has stopped work part-way through the year.

Why HMRC tax refunds happen

Tax refunds are not a sign that anyone did anything wrong. They are a normal, expected part of how PAYE works. Because tax is deducted from each payslip using an estimate of your whole-year income, any change to your circumstances mid-year can leave the estimate too high — and you pay more tax than you owe until it is corrected.

The most common reasons people overpay

If any of the following happened to you, it is worth checking whether you are owed a refund. These are the situations HMRC sees most often:

• You were on an emergency tax code — common when starting a new job without a P45, so too little of your tax-free allowance was applied at first.
• You had the wrong tax code — an out-of-date code can tax income that should have been tax-free, or apply the wrong allowances.
• You changed jobs or had more than one job — allowances can be split or duplicated incorrectly across employers.
• You stopped working part-way through the year — you may not have used your full personal allowance, leaving tax overpaid.
• You were only employed for part of the year — students and seasonal workers frequently overpay for this reason.
• You had work expenses you never claimed — such as professional fees, uniforms or working-from-home costs.
• You took a pension withdrawal — emergency tax often overtaxes the first flexible payment (see our pension tax refund guide).
• You paid too much on savings or PPI interest — tax deducted at source can exceed what you owe once your allowances are applied.
• You made Gift Aid donations or pension contributions as a higher-rate taxpayer and did not claim the extra relief.

How to check if HMRC owes you money

There are three main ways to find out whether you have overpaid tax. For most people, the fastest and most reliable is the online Personal Tax Account.

Before you start, it helps to have your National Insurance number, recent payslips or your P60 (the year-end summary from your employer), and any P45 from a job you left. These let you compare what you earned and paid against HMRC’s records.

How to use your Personal Tax Account

Your HMRC Personal Tax Account is a free online service that shows your tax information in one place. It is the single best tool for checking whether HMRC owes you a refund.

You can create or access your account on GOV.UK. To sign in you will need a Government Gateway user ID and password; if you do not have one, you can create one and verify your identity online.

How to check your PAYE records

Within your Personal Tax Account you can see your PAYE Income Tax details — the record of what each employer or pension provider has reported to HMRC. This is where many overpayments become obvious.

• Check your employers are correct — make sure every job you had in the year is listed, and that none appear twice.
• Check your pay and tax figures — compare them against your payslips and P60. Large gaps can point to an error.
• Check any benefits in kind — a company car or medical insurance affects your code (see our company car tax guide).
• Check estimated income — if HMRC’s estimate is too high, your code may be deducting too much tax.

If the figures HMRC holds do not match your own records, that mismatch is often the reason you have overpaid — and correcting it is what triggers a refund.

How to understand your tax code

In short: your tax code tells your employer how much tax-free income to give you before deducting tax. The standard code for 2025/26 is 1257L, reflecting the £12,570 personal allowance. A wrong code is one of the biggest causes of overpaid tax.

Your tax code is a short combination of numbers and letters — for example 1257L. The number, multiplied by ten, is roughly the tax-free income you get for the year (£12,570 for the standard code). The letter reflects your situation.

How P800 tax calculations work

A P800 is a tax calculation HMRC produces after the end of the tax year (which runs to 5 April) if its automatic reconciliation shows you paid too much or too little tax through PAYE. It compares the tax you paid against the tax you actually owed.

• If you overpaid — the P800 shows a refund. You may be able to claim it online to your bank account, or HMRC may send a cheque.
• If you underpaid — the P800 shows tax owed, usually collected by adjusting your tax code the following year.
• Timing — P800s are typically issued between June and November after the tax year ends.
• Only for PAYE — P800s cover people taxed under PAYE, not those who file a Self Assessment tax return.

How Simple Assessment works

A Simple Assessment is a tax bill (or refund calculation) HMRC issues to people whose tax cannot be collected automatically through PAYE but who do not need a full Self Assessment return — for example some pensioners or people with certain untaxed income.

• HMRC does the calculation — using information it already holds from employers, pension providers and banks.
• You check it — review the figures against your own records and contact HMRC within 60 days if you disagree.
• It can show a refund — if the assessment shows you overpaid, HMRC repays the difference.

Automatic refunds vs claiming yourself

Some refunds arrive without you doing anything; others you must actively claim. Knowing which applies to you avoids both unnecessary waiting and missing money you are owed.

Worked examples

The figures below are illustrative only and use the 2025/26 personal allowance of £12,570 and England, Wales and Northern Ireland tax bands. They show the principle rather than your exact outcome.

Decision tree: are you owed a refund?

How to claim your refund step by step

You can check and claim on GOV.UK – Claim a tax refund. To claim work expenses, use GOV.UK – Claim tax relief for your job expenses. HMRC pays refunds directly to you or a nominated bank account.

Tax refund timeline

How quickly you get your money depends on how you claim. As a rough guide for 2025/26, the process runs through these stages:

Common mistakes to avoid

How to avoid tax refund scams

• Never click links in unexpected “tax refund” texts or emails — go to GOV.UK directly.
• Never share your Government Gateway details, bank details or one-time codes with anyone who contacts you.
• Be wary of urgency — “claim within 24 hours” messages are a classic scam tactic.
• Check the sender — genuine HMRC messages appear inside your Personal Tax Account, not as random links.
• Report suspicious messages — forward scam emails to HMRC’s phishing team and texts to 60599.

What to do if HMRC has made a mistake

Sometimes the figures HMRC holds are simply wrong — an employer reported the wrong pay, a benefit was recorded that you never received, or a code was never updated. If you think a calculation is incorrect, you can challenge it.

• Gather your evidence — payslips, P60, P45 and bank statements that show the correct figures.
• Contact HMRC — through your Personal Tax Account, by phone or in writing, explaining what you believe is wrong.
• Act within any deadline — for a Simple Assessment you generally have 60 days to query it.
• Keep records — note who you spoke to, dates and reference numbers.
• Ask for a review or complaint — if you disagree with HMRC’s decision, you can request a formal review.

Money Tools UK tips

• Check your tax code every April — a new tax year is a natural moment to confirm it is right.
• Keep your P60 and payslips — they are your evidence if figures need correcting.
• Tell HMRC promptly when things change — a new job, retirement or benefit change keeps your code accurate.
• Claim expenses you are entitled to — small annual amounts add up over four years.
• Use official channels only — GOV.UK and the HMRC app; never a link in a message.

What should I do next?

The key lesson is empowering: checking whether HMRC owes you a refund is free, quick and entirely within your control. Most overpayments come from ordinary changes — a new job, an out-of-date tax code, or a year you did not work in full — and HMRC has clear systems to put them right. You do not need to pay anyone a share of your own money to get it back.

Start by signing in to your Personal Tax Account, confirm your tax code, and look for any P800 or Simple Assessment. Then explore the related Money Tools UK calculators and guides below to check your correct tax and keep more of what you earn — where it belongs.

Related guides

These Money Tools UK guides explain the tax rules that most often lead to refunds and overpayments.

• HMRC Pension Tax Refund Explained — why pension withdrawals are overtaxed and how to reclaim it.
• How Bonuses Are Taxed in the UK — why one-off payments are often overtaxed at first.
• Company Car Tax Explained — how benefits in kind change your tax code.
• The Personal Allowance Taper Explained — how high income erodes your tax-free allowance.
• Marriage Allowance Explained — a simple way some couples reduce their tax bill.

Related calculators

• Take-Home Pay Calculator — see how income is taxed across the 2025/26 bands.
• Salary to Hourly Calculator — convert income figures when checking your pay.
• Budget Planner — plan your monthly income and outgoings.
• Student Loan Calculator — check how repayments interact with taxable income.